For his final piece of street art in NYC, Banksy attached a huge balloon that said “Banksy!” to the side of an abandoned building on OCtober 31, 2013.

Three men tried to remove the balloon from the building that same day and were arrested. Police have confiscated the balloon piece, which an art dealer told the New York Times is worth between $200,000 and $300,000.

Police deflated the balloon which is currently being stored on the third floor of the Police Department’s building on Pearson Place in Long Island City, a police spokeswoman told the New York Times.

“I don’t have it as art on the invoice,” Deputy Chief Jack J. Trabitz told the New York Times. “We have it as a balloon.”

For more of this story, head to the New York Times.